my friend's toyo 30 quit today, giving and ee6 error. I bled the lines everywhere, took the circulating fan out and cleaned it well. The unit will will start, pump sounds good (no alarming sound of thumping) combustion fan normal, circulating fan starts, low speed, then higher speed, flame looks healthy and blue. The stove runs on high for a few minutes then gives an ee6, the flame continues to burn and look healthy for 2 or 3 minutes after the error was dispayed. I guess the only thing left is to check the overheat sensor. I have the same toyo in my shop so am going to remove the sensor and try it in my friend's heater.
Does anyone have any other ideas?
Thanks in advance.